2AXY

Crystal Structure of KH1 domain of human Poly(C)-binding protein-2 with C-rich strand of human telomeric DNA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.214 

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This is version 1.2 of the entry. See complete history. 

Literature

Crystal Structure of the First KH Domain of Human Poly(C)-binding Protein-2 in Complex with a C-rich Strand of Human Telomeric DNA at 1.7 A

Du, Z., Lee, J.K., Tjhen, R., Li, S., Pan, H., Stroud, R.M., James, T.L.

(2005) J.Biol.Chem. 280: 38823-38830

  • DOI: 10.1074/jbc.M508183200

  • PubMed Abstract: 

    • Recognition of poly(C) DNA and RNA sequences in mammalian cells is achieved by a subfamily of the KH (hnRNP K homology) domain-containing proteins known as poly(C)-binding proteins (PCBPs). To reveal the molecular basis of poly(C) sequence recognitio ...

    Recognition of poly(C) DNA and RNA sequences in mammalian cells is achieved by a subfamily of the KH (hnRNP K homology) domain-containing proteins known as poly(C)-binding proteins (PCBPs). To reveal the molecular basis of poly(C) sequence recognition, we have determined the crystal structure, at 1.7-A resolution, of PCBP2 KH1 in complex with a 7-nucleotide DNA sequence (5'-AACCCTA-3') corresponding to one repeat of the human C-rich strand telomeric DNA. The protein-DNA interaction is mediated by the combination of several stabilizing forces including hydrogen bonding, electrostatic interactions, van der Waals contacts, and shape complementarities. Specific recognition of the three cytosine residues is realized by a dense network of hydrogen bonds involving the side chains of two conserved lysines and one glutamic acid. The co-crystal structure also reveals a protein-protein dimerization interface of PCBP2 KH1 located on the opposite side of the protein from the DNA binding groove. Numerous stabilizing protein-protein interactions, including hydrophobic contacts, stacking of aromatic side chains, and a large number of hydrogen bonds, indicate that the protein-protein interaction interface is most likely genuine. Interaction of PCBP2 KH1 with the C-rich strand of human telomeric DNA suggests that PCBPs may participate in mechanisms involved in the regulation of telomere/telomerase functions.

    Organizational Affiliation: 

    Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94143-2280, USA.




Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Poly(rC)-binding protein 2
A, B, C, D
73Homo sapiensMutation(s): 0 
Gene Names: PCBP2
Find proteins for Q15366 (Homo sapiens)
Go to Gene View: PCBP2
Go to UniProtKB:  Q15366
Entity ID: 1
MoleculeChainsLengthOrganism
C-rich strand of human telomeric dnaE,F,G,H7N/A
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.214 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 66.603α = 90.00
b = 115.176β = 90.00
c = 45.525γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
SCALAdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement
DENZOdata reduction
CNSphasing
RESOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-09-27
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance